
Preliminary and subject to change without notice
PPC740 and PPC750 Hardware Specifications
12 of 43
3.1.2.3 60x Bus Output AC Specications
Table 9 provides the 60x bus output AC timing specications for the PPC740 and
PPC750 as dened in
Figure 5 . Output timing specication for the L2 bus are provided
Notes:
1. All output specications are measured from the 1.4 V of the rising edge of SYSCLK to the TTL level
(0.8 V or 2.0 V) of the signal in question. Both input and output timings are measured at the pin.
2. All maximum timing specications assume CL = 50 pF.
3. This minimum parameter assumes CL = 0 pF.
4. tsysclk is the period of the external bus clock (SYSCLK) in nanoseconds (ns). The numbers given in the
table must be multiplied by the period of SYSCLK to compute the actual time duration of the parame-
ter in question.
5. Output signal transitions from GND to 2.0 V or OVdd to 0.8 V.
6. Nominal precharge width for ABB and DBB is 0.5 tsysclk.
7. Nominal precharge width for ARTRY is 1.0 tsysclk.
8. Guaranteed by design and characterization, and not tested.
Table 9. 60X Bus Output AC Timing Specications1
2
Num
Characteristic
Min
Max
Unit
Notes
12
SYSCLK to Output Driven (Output Enable Time)
0.5
—
ns
13
SYSCLK to Output Valid (TS, ABB, ARTRY, and DBB)
—
6.5
ns
5
14
SYSCLK to all other Output Valid (all except TS, ABB,
ARTRY
, and DBB)
—
6.5
ns
5
15
SYSCLK to Output Invalid (Output Hold)
1.0
—
ns
3
16
SYSCLK to Output High Impedance (all signals except
ABB
, ARTRY, and DBB)
—
6.0
ns
8
17
SYSCLK to ABB and DBB high impedance after pre-
charge
—
1.0
tsysclk
4,6,8
18
SYSCLK to ARTRY high impedance before precharge
—
5.5
ns
8
19
SYSCLK to ARTRY precharge enable
0.2*
tsysclk
+ 1.0
—
ns
3,4,7
20
Maximum delay to ARTRY precharge
—
1
tsysclk
4,7
21
SYSCLK to ARTRY high impedance after precharge
—
2
tsysclk
4,7,8